21407962477 has 4 divisors (see below), whose sum is σ = 23354140896. Its totient is φ = 19461784060.

The previous prime is 21407962447. The next prime is 21407962481. The reversal of 21407962477 is 77426970412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21407962477 - 2¹⁹ = 21407438189 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21407962477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407962417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973089193 + ... + 973089214.

It is an arithmetic number, because the mean of its divisors is an integer number (5838535224).

Almost surely, 2^21407962477 is an apocalyptic number.

It is an amenable number.

21407962477 is a deficient number, since it is larger than the sum of its proper divisors (1946178419).

21407962477 is a wasteful number, since it uses less digits than its factorization.

21407962477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946178418.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 21407962477 in words is "twenty-one billion, four hundred seven million, nine hundred sixty-two thousand, four hundred seventy-seven".